miraj Desai thinks this is interesting:

Once again, many inexperienced developers begin to think of ways to
store several values in a single column, because the obvious solution is
to add a category column to the
joke table and use it to list the IDs
of those categories to which each joke belongs. A second rule of thumb
would be useful here: if you need to store multiple values in a
single field, your design is probably flawed.

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